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Romance fills the air when Dr. J's son, J. Jr., brings his new girlfriend home from college. What a girl - a physicist's dream! She is doing graduate research in magnetism and she lets it affect her whole life. She drives a car with mag wheels. She graduated from school magna cum laude. She is Polish, very attractive, and J. Jr. thinks she is magnificent! Her name, of course, is Maggie. J. Jr. is talking marriage, but Dr. J offers his advice: "Beware," says Dr. J, "a woman like that can turn around and become just as repulsive as she is attractive. Besides," he continues, "they rule with a strong left hand!" Fortunately for J. Jr., he discovers for himself that she isn't his dream girl after all. He notices that her work comes first and everything else second. When she asks J. Jr. to go with her to mass, he thinks she means church, but instead he winds up sitting in a lab while she plays with a mass spectrograph. The conversation goes like this:
"Maggie, I fear that potentially there could be a difference between us."
"Huh? Oh yes, I set it at 7000 volts."
"No, no - don't you feel anything between us anymore?"
"Field? Oh yes, it is 12,000 Gauss."
"Don't you get a charge out of being with me?"
"Charge? Why, 1.6 x 10-19 coulombs, of course."
"Maggie, I think we've drifted too far apart."
"Apart? Let's see - the radius is 12.5 cm.
Would you compute the mass, dear, and look up what element that is?" With that, J. Jr. walks out in disgust, never to see Maggie again, though he does look at tables periodically.
What is the mass of the element that eventually came between J. Jr. and Maggie?
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Forces Between Ceramic Magnets
Magnetic Field in a Solenoid
Mass of an Electron
A Comparison of RC and RL Circuits
A Guide to Biot-Savart Law
Eddy Currents plus a Lab Simulation
Electricity and Magnetism Background
Famous Experiments: Cathode Rays
Introduction to Magnetism
Magnetic Field Along the Axis of a Current Loop
Magnetic Forces on Particles (Part II)
Magnetism: Current-Carrying Wires
Meters: Current-Carrying Coils
Torque on a Current-Carrying Loop
The Tree House
Meters and Motors
Magnetic Forces on Current-Carrying Wires
Magnetic Forces on Moving Charges
Practice with Ampere's Law
36A: Magnets, Magnetic Fields, Particles
36B: Current Carrying Wires
Exercises on Current Carrying Wires
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Copyright © 1998-2017
Catharine H. Colwell
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Mainland High School
Daytona Beach, FL 32114